Three-dimensionally constructed warp knit fabric with slippage-preventive yarns

ABSTRACT

A three-dimensionally constructed warp knit fabric formed to include front-surface and back-surface ground knit constructions and connection yarns interconnecting the front-surface and back-surface ground knit constructions has insertion yarns between the connection yarns, in which the insertion yarn is fixed along the inner side of the back-surface ground knit construction. Further, the insertion yarn is fixed by a fixing yarn to the back-surface ground knit construction.

TECHNICAL FIELD

The present invention relates to a three-dimensionally constructed warpknit fabric used as a material, such as a cushion material and a fillermaterial, in clothing fields; and more particularly, as a material suchas a vehicle seat material in industrial material fields. Morespecifically, the present invention relates to a three-dimensionallyconstructed warp knit fabric that has pressure resistance andcompressive elasticity, that is composed of primary constructionalmembers inclusive of a front-surface ground knit construction and aback-surface ground knit construction, connection yarns interconnectingthese constructions, and insertion yarns fixed between the connectionyarns, and that has the capability of effectively preventing slippagebetween the ground knit constructions.

BACKGROUND ART

Hitherto, various proposals have been made regarding three-dimensionallyconstructed warp knit fabrics formed of a front-surface ground knitconstruction, a back-surface ground knit construction, and connectionyarns interconnecting these constructions.

These three-dimensionally constructed warp knit fabrics are formedprimarily such that textile materials are knitted by using a knittingmachine with double-row needle carriers.

Connection yarns include those of, for example, a type having orthogonalconnection yarns used for interconnection substantially in an orthogonalstate with respect to front-surface and back-surface ground knitconstructions, a type having oblique connection yarns used forinterconnection substantially in an oblique state with respect tofront-surface and back-surface side sections, a type of a trussstructure having both orthogonal and oblique connection yarns.

For these conventional three-dimensionally constructed warp knitfabrics, key points are to find out an orthogonal state that should beused to enhance the pressure resistance of front-surface andback-surface ground knit constructions of the connection yarns. Morespecifically, the key points are to find out a type of the trussstructure of the connection yarns should be formed to prevent slippagethe constructions, and how to enable the prevention of slippage betweenfront-surface and back-surface ground construction to be attained andconcurrently to obtain the pressure resistance of the ground knitconstructions, or the type of materials should be used for connectionyarns to obtain the pressure resistance of the ground knitconstructions.

However, for these conventional three-dimensionally constructed warpknit fabrics, the above-described means, which places importance on thepressure resistance to obtain the compressive elasticity thereof,greatly relies on the means that employs the truss structure, usesconnection yarns with higher elasticity, and especially, uses theconnection yarns with high density.

As such, problems take place in that when pressure is applied, the highelasticity connection yarns are bent and entangled with one another,whereby the compressive elasticity is deteriorated.

In addition, in a case where net constructions are employed for both orany one of the front-surface and back-surface ground knit constructions,the connection yarns overextend from open portions of the netconstructions, the wearing is caused from the outside, the nap isthereby caused on the overextended portions.

This causes obnoxious feeling to be provided in use and causes theappearance to deteriorate.

Known knit fabrics that solve problems such as those described aboveinclude a three-dimensional knit fabric that includes a front-surfaceground knit construction and a back-surface ground knit construction,connection yarns for interconnecting the front-surface and back-surfaceground knit constructions, pluralities of warp insertion yarns and/orweft insertion yarns parallelly inserted between the connection yarns,wherein at least one lay of the warp insertion yarns form a knitconstruction in interengagement with the warp insertion yarns. (Refer toPatent Reference Document 1).

According to this method, however, since the plurality of insertionyarns are used, not only cloth is formed to be thick with texture massbeing increased, but also flexibility of the cloth is impaired.

In addition, since the plurality of insertion yarns are used, insertionyarns are knitted in proximity with one another or are congested withone another depending on the use condition whereby disabling theconnection yarns to be bound.

As a result, the pressure resistance, the inter-ground knit constructionslippage preventability, and the like are not necessarily sufficientlyimproved.

(Patent Reference Document 1) Japanese Unexamined Patent ApplicationPublication No. 62-45760

DISCLOSURE OF INVENTION

The present invention is made to solve the problems described above.

More specifically, an object of the present invention is to secure athree-dimensionally constructed warp knit fabric excellent in pressureresistance and inter-ground knit construction slippage preventabilitywithout impairing cloth flexibility and the like.

In order to solve the problems described above, in making the presentinvention, it has been discovered that in addition to the constructionalmembers as observed in the conventional three-dimensionally constructedwarp knit fabric, namely the front-surface ground knit construction, theback-surface ground knit construction, and the connection yarns,insertion yarns, are fixed along an inner side of the ground knitconstruction, whereby bending and congestion occurrences, for example,when the construction is compressed can be prevented as many aspossible, elasticity deterioration can be prevented, and inter-groundknit construction slippage can be effectively prevented withoutimpairing cloth flexibility. Consequently, the present invention hasbeen accomplished.

The present invention provides the following.

(1) A three-dimensionally constructed warp knit fabric formed to includetwo front-surface and back-surface ground knit constructions andconnection yarns interconnecting the front-surface and back-surfaceground knit constructions characterized by comprising insertion yarnsbetween the connection yarns, wherein the insertion yarn is fixed alongthe inner side of the back-surface ground knit construction.

(2) The three-dimensionally constructed warp knit fabric characterizedin that the insertion yarn is fixed by a fixing yarn to the back-surfaceground knit construction.

(3) The three-dimensionally constructed warp knit fabric characterizedin that the insertion yarn is inserted in a course direction and/or awale direction.

(4) The three-dimensionally constructed warp knit fabric characterizedin that in a portion where the insertion yarn is fixed by a fixing yarn,the number of overlapped insertion yarns is 2–6, a total fineness all ofthe overlapped insertion yarns is 334–8400 dtex.

(5) The three-dimensionally constructed warp knit fabric ischaracterized in that an insertion density of the insertion yarns, shownby expression 1, is 0.006–0.4 g/cm³, whereininsertion density=S/10000T  (1)

where

S: amount of insertion yarn usage per 1 m² (g), and

T: thickness of the three-dimensionally constructed warp knit fabric(cm).

(6) A manufacturing method for a three-dimensional warp knit formed toinclude two front-surface and back-surface ground knit constructions andconnection yarns interconnecting the two front-surface and back-surfaceground knit constructions is characterized in that the insertion yarnsare inserted between the connection yarns, and the insertion yarn isfixed by fixing yarns along the inner side of the back-surface groundknit construction.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view schematically showing athree-dimensionally constructed warp knit fabric.

FIG. 2 is a schematic cross-sectional view of the three-dimensional warpknit taken along a course direction of FIG. 1.

FIG. 3 is a schematic cross-sectional view of the three-dimensional warpknit taken along a wale direction of FIG. 1.

FIG. 4 is a construction view of a three-dimensionally constructed warpknit fabric of Example 1.

FIG. 5 is a construction view of a three-dimensionally constructed warpknit fabric of Example 2.

FIG. 6 is a construction view of a three-dimensionally constructed warpknit fabric of Example 3.

FIG. 7 is a construction view of a three-dimensionally constructed warpknit fabric of Example 4.

FIG. 8 is a construction view of a three-dimensionally constructed warpknit fabric of Example 5.

FIG. 9 is a construction view of a three-dimensionally constructed warpknit fabric of Comparative Example 1.

FIG. 10 is a construction view of a three-dimensionally constructed warpknit fabric of Comparative Example 2.

FIG. 11 is a schematic view showing an essential knit portion of adouble-row needle carrier warp knitting machine (double raschelmachine).

FIG. 12 is an explanatory view showing the relationship between aninsertion yarn and a fixing yarn.

REFERENCE NUMERALS

-   -   1 three-dimensionally constructed warp knit fabric    -   2 front-surface ground knit construction    -   3 back-surface ground knit construction    -   4 connection yarn    -   5 insertion yarns    -   6 open portion    -   A1, A5, A6 ground yarn    -   A2 insertion yarn    -   A3 connection yarn    -   A4 fixing yarn

The present invention may have a combined construction of two or moreones selected from items 1 to 6 described above, as long as it satisfiesthe object.

BEST MODE FOR CARRYING OUT THE INVENTION

A three-dimensionally constructed warp knit fabric of the presentinvention is composed of primary constructional members inclusive offront-surface and back-surface ground knit constructions, connectionyarns interconnecting the front-surface and back-surface ground knitconstructions, and insertion yarns fixedly held between the connectionyarns along inner portions of ground knit constructions.

The three-dimensionally constructed warp knit fabric has characteristicsin that it has optimal pressure resistance (compression resistance) andcompressive elasticity, is capable of effectively preventing slippagebetween the ground knit constructions in a course direction and/or awale direction, and does not cause deterioration in flexibility.

Referring to FIG. 11, the three-dimensionally constructed warp knitfabric can be obtained by being knitted using a double-row needlecarrier warp knitting machine (double raschel machine).

A ground yarn A1 is supplied to a guide bar L-1 (represented by “L1” inFIG. 11), and a back-surface ground knit construction B is formed by aback needle BN.

An insertion yarn A2 is supplied to a guide bar L-2, is guided by theback needle BN along the inner portion of the back-surface ground knitconstruction B, and is then fixed by a fixing yarn A4.

Ground yarns A5 and A6 are supplied to guide bars L-5 and L-6,respectively, and a front-surface ground knit construction F is formedby a front needle FN.

A connection yarn A3 is guided by a guide bar L-3 to the front needle FNand the back needle BN, and is sequentially knitted into thefront-surface ground knit construction F and the back-surface groundknit construction B to interconnect the two constructions.

A fixing yarn A4 is guided by a guide bar L-4 to the front needle FN, isknitted to fix the insertion yarn A3, and is sequentially knitted intothe back-surface ground knit construction B.

As the structure is exemplified by in construction views of FIGS. 4 to6, in the three-dimensionally constructed warp knit fabric of thepresent invention, the insertion yarn on the guide bar L-2 is fixedalong the inner portion of the back-surface ground knit construction onthe guide bar L-1.

A fixing yarn (chained yarn) on the guide bar L-4 is knitted to strandover the connection yarns on the guide bar L-3, and the insertion yarnon the guide bar L-2 is fixed by the fixing yarn on the guide bar L-4 tothe back-surface ground knit construction.

FIG. 1 is a schematic perspective view schematically showing athree-dimensionally constructed warp knit fabric.

The drawing shows a state where insertion yarns 5 (shown by singledotted chain lines) are each knitted along an inner portion of aback-surface ground knit construction of a three-dimensionallyconstructed warp knit fabric 1 in the wale direction.

A front-surface ground knit construction 2 has an open portion 6. Theopen portion 6 is easily formed in the manner that a yarn-draw-offportion is formed during lapping movement when the guide bar L-1 and theguide bar L-2 are used for knitting operation.

FIG. 2 is a schematic cross-sectional view of the three-dimensional warpknit taken along the course direction of FIG. 1.

From the drawing, a state where the insertion yarn 5 is knitted along aback-surface ground knit construction 3 between connection yarns can bemore clearly known.

In this state, a connection yarn 4 is supported by the insertion yarns 5in the inner portion of the back-surface ground knit construction 3 withrespect to the course direction.

FIG. 3 is a schematic cross-sectional view of the three-dimensional warpknit taken along the wale direction of FIG. 1.

From the drawing, it can be understood that the insertion yarns 5 isknitted along the inner portion of the back-surface ground knitconstruction 3, and the insertion yarns 5 can be visually recognizedthrough the open portion 6.

A state where the insertion yarn is fixed to the back-surface groundknit construction by the fixing yarn is not shown in FIGS. 1 to 3 (thisstate will be described below).

As shown in FIGS. 1 to 6, the three-dimensionally constructed warp knitfabric of the present invention has the construction in which theinsertion yarn is fixed to the front-surface ground knit construction inthe wale direction along the inner portion of the ground knitconstruction between the connection yarns knitted in the coursedirection, whereby the connection yarn is restrained.

For this reason, the connection yarns on the side of the back-surfaceground knit construction are rendered not to be easily movable, and theconnection yarns are rendered not to easily be congested with oneanother.

In the construction thus formed, high compressive elasticity isexhibited against a load in the thickness, and the connection yarns arerendered to be not easily collapsible. This consequently causes thefront-surface and back-surface ground knit constructions not to beeasily movable, so that the constructions high slippage preventabilityagainst pressure exerted from the course direction.

With reference to these drawings, description has been made regardingthe case where the insertion yarns are inserted and fixed only in thewale direction. Of course, however, the insertion yarns may be knittedin both the wale direction and the course direction.

In the case where the insertion yarns are inserted and knitted only inthe course direction, the state is such that the connection yarns arerestrained by the insertion yarns in the inner portion of theback-surface ground knit construction with respect to the waledirection.

In addition, in a case where the insertion yarns are knitted in bothdirections, the ground knit constructions can be prevented from beingmisaligned when a load is exerted not only in the wale direction butalso in the course direction.

The individual structures of the insertion yarns may be disposed betweenall the individual connection yarns or may be inserted at predeterminedpitches.

For example, in the three-dimensionally constructed warp knit fabricshown in FIG. 1, the insertion yarns 5 may only be alternately knitted(with an insertion yarn a and an insertion yarn b, for example).

For the total fineness of one insertion yarn used in the presentinvention, a range of 167 dtex to 1400 dtex is preferably employed, anda range of 222 dtex to 990 dtex is more preferably employed.

When the total fineness is less than 167 dtex, the yarn is likely todistort, thereby making it difficult to sufficiently support theconnection yarn. On the other hand, when the fineness is 1400 dtex orgreater, the cloth texture can be excessively hard.

In the three-dimensionally constructed warp knit fabric of the presentinvention, the insertion yarn is fixed by the fixing yarn to the groundknit construction.

FIG. 12 is an explanatory view showing the relationship between theinsertion yarn and the fixing yarn.

In the portion where the insertion yarns are fixed, the drawing showsthat the insertion yarn is held by the fixing yarn, and there areoverlap portions of two yarns (for the yarn arrangement, see theinsertion yarn on the guide bar L-2 in the construction view of FIG. 4and the fixing yarn on the guide bar L-4).

In this case, the number of overlapped insertion yarns is 2–6, andpreferably 3–5; and the total fineness of the overlapped insertion yarnsis preferably 334–8400 dtex, and more preferably 501–7000 dtex.

When the total fineness is less than 334 dtex, the yarns are likely todistort whereby making it difficult to sufficiently support theconnection yarn. On the other hand, when the fineness is 8400 dtex orgreater, the cloth texture can be excessively hard.

As the types of yarns for the insertion yarns, a multifilament yarn ofcomposite textile of polyester or the like, a monofilament yarn, and afinished yarn and a spun yarn thereof may be used.

In addition, with ornamental yarns being used for the insertion yarns, athree-dimensionally constructed warp knit fabric can be formed thatexhibits special ornamental characteristics with which the insertionyarns knitted along the inner portion of the back-surface ground knitconstruction can be visually recognized from the open portions of thefront-surface ground knit construction and that has less slippagebetween the front-surface and back-surface ground knit constructions.

In addition, according to the three-dimensionally constructed warp knitfabric of the present invention, for an insertion density(insertion-yarn weight per unit volume of the three-dimensionallyconstructed warp knit fabric) to be calculated from expression 1 shownbelow, a range of 0.006 –0.4 g/cm³ is employed; and preferably, a rangeof 0.019–0.18 g/cm³ is employed from the viewpoint of the pressureresistance and alignment preventability.

When the insertion density is lower than 0.006 g/cm³, a case can occurin which the insertion yarn cannot sufficiently support the connectionyarn, the pressure resistance deteriorates, and the alignmentpreventability deteriorates. On the other hand, the case where theinsertion density is higher than 0.4 g/cm³ is not preferable becausethere can occur a case where the texture is hard, air permeabilitydeteriorates, and the texture mass increases.Insertion density=S/10000T  (1),

where

S: amount of insertion yarn usage per 1 m² (g), and

T: thickness of the three-dimensionally constructed warp knit fabric(cm).

EXAMPLES

The present invention will be exemplified hereinbelow with reference toexamples. However, the present invention is not limited to the examples.

Measurement methods used in the examples are as described hereunder.

Thickness Maintainability

Thickness-maintainability verification test materials having the size of7 cm×7 cm, four pieces of the materials are stacked for easyidentification of thickness verifications, and a 5 kg circularcylindrical weight having a diameter of 7 cm is placed on the topthereof.

In this state, the test materials were kept at 100° C. for two hours toexpedite the thickness variation.

After two hours has passed, values were obtained from the expression“thickness maintainability (%)=L2/L1×100, where L2 represents apost-testing thickness immediately after removal of the weight, and L1represents a thickness before the weight is placed.

◯: Thickness maintainability=75% or higher

Δ: Thickness maintainability=70–75% or lower

X: Thickness maintainability=70% or lower

The thickness maintainability is an index representing the pressureresistance (compression resistance).

Alignment Preventability

Thickness-maintainability verification test materials having the size of7 cm×7 cm, and a 5 kg circular cylindrical weight having a diameter of 7cm is placed on the top thereof.

In this state, a microscope is used to photograph the states ofconnection yarns before and after a load is applied.

At this time, attention is drawn to one marked connection yarn, and thedifference in slippage states of front-surface and back-surface groundknit constructions before and after the load is applied werephotographed.

◯: Connection yarn slippage width=75 mm or less

Δ: Connection yarn slippage width=7–10 mm or less

X: Connection yarn slippage width=10 mm or larger

Example 1

A double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 4.

A back-surface ground knit construction was formed with a guide bar L-1,a front-surface ground knit construction having an open portion wasformed with guide bars L-5 and L-6, and these constructions wereconnected using a connection yarn on a guide bar L-3. Then, an insertionyarn on a guide bar L-2 of 950 dtex was fixed using a fixing yarn on aguide bar L-4 along the ground-knit-construction inner portion oppositethe open portion (i.e., inner portion of the back-surface ground knitconstruction). In this manner, the three-dimensionally constructed warpknit fabric with a finished density 36 courses: 23 wales, and athickness of 3.0 mm was prepared.

The mass was 550 g/m².

The number of overlapped yarns between wales fixed with the insertionyarns was two, and the yarn size between the wales was 1900 dtex.

The insertion density was 0.096 g/cm³.

The performance is shown in Table 1.

Example 2

The double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 5.

A back-surface ground knit construction was formed with a guide bar L-1,a front-surface ground knit construction having an open portion wasformed with guide bars L-5 and L-6, and these constructions wereconnected using the connection yarn on a guide bar L-3. Then, asinsertion yarn on a guide bar L-2 of 1250 dtex was fixed using a fixingyarn on a guide bar L-4 along the inner portion of the back-surfaceground knit construction. In this manner, the three-dimensionallyconstructed warp knit fabric with a finished density 36 courses: 23wales, and a thickness of 3.0 mm was prepared.

The mass was 580 g/m².

The number of overlapped yarns between wales fixed with the insertionyarns was three, and the yarn size between the wales was 3750 dtex.

The insertion density was 0.196 g/cm³.

The performance is shown in Table 1.

Example 3

The double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 6.

A back-surface ground knit construction was formed with a guide bar L-1,an open-portion ground construction was formed with guide bars L-5 andL-6, and these constructions were connected using the connection yarn ona guide bar L-3. Then, an insertion yarn on a guide bar L-2 of 750 dtexwas fixed using a fixing yarn on a guide bar L-4 along the inner portionof the back-surface ground knit construction. In this manner, thethree-dimensionally constructed warp knit fabric with a finished density36 courses: 23 wales, and a thickness of 3.0 mm was prepared.

The mass was 560 g/m².

The number of overlapped yarns between wales fixed with the insertionyarns was four, and the yarn size between the wales was 3000 dtex.

The insertion density was 0.173 g/cm³.

The performance is shown in Table 1.

Example 4

The double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 7.

A back-surface ground knit construction was formed with a guide bar L-1,a front-surface ground knit construction having an open portion wasformed with guide bars L-5 and L-6, and these constructions wereconnected using the connection yarn on a guide bar L-3. Then, aninsertion yarn on a guide bar L-2 of 167 dtex was fixed using a fixingyarn on a guide bar L-4 along the ground-knit-construction inner portionopposite the open portion (i.e., inner portion of the back-surfaceground knit construction). In this manner, the three-dimensionallyconstructed warp knit fabric with a finished density 36 courses: 23wales, and a thickness of 3.0 mm was prepared.

The mass was 500 g/m².

The number of overlapped yarns between wales fixed with the insertionyarns was two, and the yarn size between the wales was 334 dtex.

The insertion density was 0.017 g/cm³.

The performance is shown in Table 1.

Example 5

The double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 8.

A back-surface ground knit construction was formed with a guide bar L-1,a front-surface ground knit construction having an open portion wasformed with guide bars L-5 and L-6, and these constructions wereconnected using the connection yarn on a guide bar L-3. Then, aninsertion yarn on a guide bar L-2 of 1400 dtex was fixed using a fixingyarn on a guide bar L-4 along the inner portion of the back-surfaceground knit construction. In this manner, the three-dimensionallyconstructed warp knit fabric with a finished density 36 courses: 23wales, and a thickness of 3.00 mm was prepared.

The mass was 600 g/m².

The number of overlapped yarns between wales fixed with the insertionyarns was four at maximum, and the yarn size between the wales was 5600dtex.

The insertion density was 0.323 g/cm³.

The performance is shown in Table 1.

Comparative Example 1

The double raschel knitting machine, KARL MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 9.

A back-surface ground knit and a front-surface group knit constructionhaving an open portion were formed, and the constructions were connectedwith connection yarns. In this manner, the three-dimensionallyconstructed warp knit fabric with a finished density 36 courses: 23wales, and a thickness of 3.0 mm was prepared.

The mass was 500 g/m².

The performance is shown in Table 1.

Comparative Example 2

The double raschel knitting machine, KARL-MAYER-made modelRD6DPLM-77E-22G, was used to prepare a three-dimensionally constructedwarp knit fabric as shown in a construction view of FIG. 10.

A back-surface ground knit and a front-surface ground knit constructionhaving an open portion were formed, and connection yarns of 900 dtexwere inserted between connection yarns of the front-surface andback-surface ground knit constructions such as to float in substantiallythe center portion between the ground knit constructions. In thismanner, the three-dimensionally constructed warp knit fabric with afinished density 36 courses: 23 wales, and a thickness of 3.0 mm wasprepared.

The mass was 650 g/m².

The insertion density was 0.044 g/cm³.

The performance is shown in Table 1.

TABLE 1 Insertion density Thickness Slippage width (g/cm³)maintainability Vertical Horizontal Example 1 0.096 ◯ ◯ ◯ Example 20.196 ◯ ◯ ◯ Example 3 0.173 ◯ ◯ ◯ Example 4 0.017 ◯ ◯ ◯ Example 5 0.323◯ ◯ ◯ Comparative — X X X example 1 Comparative 0.044 Δ Δ X example 2

As described above, the present invention can be modified without beinglimited by, for example, the embodiments and examples as long as theobject is satisfied.

As long as the insertion yarns in the three-dimensionally constructedwarp knit of the present invention are fixed along the inner portion ofthe back-surface ground knit construction whereby to enable slippage ofthe connection yarns in the course and/or wale directions to beprevented, the types thereof may be modified.

EFFECTS OF THE INVENTION

The three-dimensionally constructed warp knit fabric of the presentinvention is formed to include two front-surface and back-surface groundknit constructions and connection yarns interconnecting the twofront-surface and back-surface ground knit constructions employs theconstruction comprising insertion yarns between the connection yarns,wherein the insertion yarn is fixed along the inner side of theback-surface ground knit construction. Accordingly, bending andcongestion occurrences when, for example, the construction is compressedcan be prevented as much as possible, elasticity deterioration due tocongestion between bent connection yarns can be prevented, andinclination of the connection yarns can be prevented.

As such, even upon reception of a force in the course direction or thewale direction depending on the insertion direction of the insertionyarns, the three-dimensionally constructed warp knit fabric of thepresent invention can effectively prevent the ground knit constructionsfrom being misaligned in the wale direction or the course direction.

In addition, the insertion yarn is required only to be fixed along theinner portion of the back-surface ground knit construction.Consequently, the three-dimensionally constructed warp knit fabric canbe formed to have the capability of restraining an increase in the clothmass, which is caused due to the use of a plurality of insertion yarnsin the thickness direction as in the conventional case, and to havepressure resistance and excellent alignment preventability between theground knit constructions.

INDUSTRIAL APPLICABILITY

The present invention relates to a three-dimensionally constructed warpknit fabric used as a material, such as a cushion material and a fillermaterial, in clothing fields; and more particularly, as a material suchas a vehicle seat material in industrial material fields. However,without departing from the principle of the present invention, theinvention may be applied to a wide range of industrial fields of, forexample, construction-work dedicated seats and medical dedicated seats.

1. A three-dimensionally constructed warp knit fabric formed to includefront-surface and back-surface ground knit constructions and connectedyarns interconnecting the front-surface and back-surface ground knitconstructions, the three-dimensionally constructed warp knit fabricbeing characterized by comprising an insertion yarn inserted between theconnection yarns, wherein the insertion yarn is fixed by a fixing yarnalong an inner side of the back-surface ground knit construction.
 2. Athree-dimensionally constructed warp knit fabric of claim 1,characterized in that the insertion yarn is inserted in at least one ofa course direction and a wale direction.
 3. A three-dimensionallyconstructed warp knit fabric of claim 1, characterized in that in aportion where the insertion yarn is fixed by a fixing yarn, the numberof overlapped insertion yarns is 2–6 and a total fineness of all theoverlapped insertion yarns is 334–8400 dtex.
 4. A three-dimensionallyconstructed warp knit fabric of claim 1, characterized in that aninsertion density of the insertion yarn, shown by expression 1, is0.006–0.4 g/cm³, whereininsertion density=S/10000T  (1) where S: amount of insertion yarn usageper 1 m² (g), and T: thickness of the three-dimensionally constructedwarp knit fabric (cm).
 5. A manufacturing method for a three-dimensionalwarp knit fabric formed to include front-surface and back-surface groundknit constructions and connection yarns interconnecting thefront-surface and back-surface ground knit constructions, comprising thesteps of inserting an insertion yarn between the connection yarns andfixing the insertion yarn by fixing yarns along an inner side of theback-surface ground knit construction.